Clamp for supporting tackle-block straps while riveting the same



(No Model.) A s Sheets-Sheet 1.

G. A. FORD.

CLAMP FOR SUPPORTING TACKLE BLOGK STRAPS WHILE RIVETING THE SAME.

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- G. A. FORD.

CLAMP FOR SUPPORTING TACKLE BLOCK STRAPS WHILE RIVETING THE SAME.

No. 391,409. Patented Oct. 23, 1888.

IHIIIIHHI I .ll H II H I' I (No Model.) 3 Sheets-Sheet 3.

G. A. FORD. CLAMP FOR SUPPORTING TACKLE BLOCK STRAPS WHILE RIVETING THESAME.

Patented Oo t. 23,1888;

UNITED STATES I PATENT Urrrcn.

GEORGE A. FORD, OF CLEVELAND, OHIO.

CLAMP FOR SUPPORTING TACKLE-BLOCK STRAPS WHILE RIVETING THE SAME-SPECIPICATION forming part of Letters Patent No. 391,409, dated October23, 1888.

. Application filed June 21, 1888. Serial No. 277,719. (No modeLi T0 (0%whom it may concern.-

Be it known that I, GEORGE A. FORD, of Cleveland, in the county ofGuyahoga and State of Ohio, have invented certain new and. usefulImprovements in Tackle- Blocks; and I do hereby declare the following tobe a full, clear, and exact description of theinvention, such as willenable others skilled in the art to which it pertains to make and usethe same.

My invention relates to an apparatus for riveting the tackle-block shelldescribed in United States Letters Patent No. 368,144, granted to meAugust 9, 1887.

In the accompanying drawings, Figure l is a plan partly in section. Fig.2 is an elevation in section on the line as m, Fig. 1. Fig. 3 is anelevation, partly in section, on the line i 1 Fig. 1. Fig. 4 is a viewin perspective of an end portion of a tackle-block casing, portionsbeing broken away to show the construction. Fig 5 is an inside endelevation of the rivetingblocksin their relative position to each other,and Fig. 6 is a side elevation of the same. Fig. 7 is a plan of thewedge. Fig. 8 is a view in perspective of a center-piece for doubleblock.

A represents the cheek-pieces of the tackleblock, the same beingflanged, as shown at a, a, and a. B B are the draftstraps, and C O arethe external and internal plates that hold the cheek-pieces in place,theplates and cheekpieces being riveted together. The sheaveaxle e is alsoshown. These are all of-the members of the tackle-block that arenecessary to show in illustrating my riveting de vice, the parts thusfar being lettered the same as in the aforesaid patent.

The parts are assembled and held in place by clamp G during the rivetingoperation, the clamp fitting accurately the periphery or edge of thetackleblock casing. The clamp is made in two sections, the one sectionhaving inortises g at the end, and the other section havingengagingtenons g, with the transverse pins 9 for holding the members ofthe clamp together. Before the tackleblock shell is placed in the clamp,blocks H are arranged internally at either end of the shell, such blocksbeing held firmly in place against the internal metal plate, 0, by meansof wedge I, interposed between opposing blocks. This wedge has a slot,z, for straddling the axle 6.

Blocks II have slight conical depressions h,in which the inner ends ofthe rivets are upset to form the inner heads of the rivets. The extremeedges h of blocks H fit it between the body of the cheek-piece andflange a. Notches h are for the passage of the draftstraps, the latterbeing inserted through notches G of the clamp after the shell, withblocks H in place, is secured in the clamp. The wedge I engages the endsof the riveting-block at H, and consequently the one wedge may tightenthe four blocks H in case of a single sheaveshell. The wedge is thinenough to allow the draft-straps to pass on either side of it. The clampis provided with holes G where the rivets J occur, and a drill (shown inFig. 1) is provided, a section, L, of the shank of the drill fittingnicely in hole G, by means of which the drill is guided to its place ofwork. A shoulder, L, by engaging the clamp, forms a stop. The drillproper,l,is just long enough to extend through the flanges of thecheekpieces and through the inner and outer plates, 0 and 0. Section Zof the drill cuts a countersink in plates 0. Next the rivets areinserted, the inner ends of the rivets resting against blocks H indepressions h. Punch or upset K fits in hole G the end of the punchhaving a countersink, k, for forming the outer heads of the rivets.These rivets are usually only about three-eighths of an inch long, andasharp blow of the hammer is usually sufiicient to upset the rivets toform the internal and external heads. After the riveting, pin 6 isremoved, and this releases the draft-straps, which are also removed,after which the clamp may be taken off.

In case of more than one sheave, additional blocks,M,are provided, theedges of which fit between the flanged edges of center-pieces, D, andare wedged apart into the ends of the shell for upsetting the rivetsthat secure tongs d (see patent aforesaid) to the plates 0 C. For eachadditional sheave additional blocks and wedges I are provided.

It requires some little practice to assemble the parts with dispatch,but with expert workmen a tackle-block may be riveted, including theassembling of the pieces and closing and opening the clamp, in from fiveto eight minutes.

\Vhat I claim is 1. The combination, with a clamp for embracing the edgeof a tackle-block shell of the variety indicated, of blocks adapted tofit internally the ends of the shell where the rivets occur, such blockshaving depressions for forming the inner heads of the rivets, and one ormore wedges for engaging the opposing ends of the blocks for holding thelatter in place, substantially as set forth.

2. The combination, with riveting-blocks and wedges, substantiallyasindicated, of clamp for embracing the edge of the tackle-block shell,such clamp being made in detachable sections, and the clamp having holesfor inserting the drill and rivets, substantially as 15 set forth.

In testimony whereof I sign this specification, in the presence of twowitnesses, this 27th day of February, 1888.

GEORGE A. FORD.

Witnesses:

CHAS. H. DORER, ALBERT E. LYNCH.

